摘要
With the support of 18 AMS-14C data, a high-resolution pollen record from the Suancigou section at Jingning, Gansu Province was established. Our results showed that the vegetation ex-perienced a series of changes characterized by the alternative growth and decline of forest and steppe components during the period from 44.2 to 11 ka B.P. in the Jingning area. Over the period of 44―29 ka B.P. (MIS3), coniferous forests were flourishing, indicating a humid climate with the tem-perature being lower than that of the present. Since 23 ka B.P., the vegetation was dominated by steppe-desert steppe under a cold and dry condition, and entered the Last Glacial Maximum domi-nated by desert steppe. Several periods of the marked decrease in the arborous pollen content in Suancigou well corresponded to the North Atlantic Heinrich events, especially to Heinrich event 3, further supporting that the Heinrich events were well reflected by the pollen record in the Loess Pla-teau as well.
With the support of 18 AMS-^(14)C data, a high-resolution pollen record fromthe Suancigou section at Jingning, Gansu Province was established. Our results showed that thevegetation experienced a series of changes characterized by the alternative growth and decline offorest and steppe components during the period from 44.2 to 11 ka B.P. in the Jingning area. Overthe period of 44-29 ka B.P. (MIS3), coniferous forests were flourishing, indicating a humid climatewith the temperature being lower than that of the present. Since 23 ka B.P., the vegetation wasdominated by steppe-desert steppe under a cold and dry condition, and entered the Last GlacialMaximum dominated by desert steppe. Several periods of the marked decrease in the arborous pollencontent in Suancigou well corresponded to the North Atlantic Heinrich events, especially to Heinrichevent 3, further supporting that the Heinrich events were well reflected by the pollen record inthe Loess Plateau as well.
作者
LI Chunhai12, TANG Lingyu1, FENG Zhaodong3,4, ZHANG Hucai2, WANG Weiguo3 & AN Chenbang3 1. Nanjing Institute of Geology and Palaeontology, Chinese Academy of Sciences, Nanjing 210008, China
2. Nanjng Institute of Geography and Limnology, Chinese Academy of Sciences, Nanjing 210008, China
3. Environment and Resources College, Lanzhou University, Lanzhou 730000, China 4. Beijing Normal University, Beijing 100875, China
基金
supported by the National Natural Science Foundation of China(Grant No.40025105)
the Knowledge Innovation Program of CAS(Grant No.KZCK1-10)
the Hundred Talents Project of CAS(Zhang Hucai).
